Heat interchange apparatus



J 1935- R. E. KAESTNER HEAT INTERCHANGE APPARATUS Filed July 30, 1934 6 2 Z a" 5 f z o W/ W F a/u M uu Z 6. .W/ .5/ w H f 4 HM i M 1 L 5%;

flaierizzfaesifler Patented June 25, 1935 HEAT INTER-CHANGE APPARATUS Robert E. Kaestner, Baltimore, Md.,'assignor to 'E. A. Kaestner Compan Maryland y, a corporation of Application July30, 1934, Serial No. 737,658

3Claims. (o1.257 10s) r This invention relatesto heat-interchange apparatus andhas special reference to devices employed in heating, holding, cooling and storing liquids, and more particularly milk, cream, ice

cream. mixes and other dairy products during pasteurization, cooling and in storage.

Among the objects of this invention is to pro- ;yide a simple, highly efiic'ient and inexpensive means forovercoming the objections in devices heretofore used for such trcatment'of milk, cream,

ice cream mixes, etc.

More specifically it is an object of this invention to provide a highly efiicient heat-transfer construction between the hollow coil portion through which the cooling medium is passed and theinterior of the vessel containing the liquid to be cooled.

- Other, further and more specific objects of this invention will be readily apparent to persons skilled in the art from a consideration of the following description whentaken in conjunction with the accompanying drawing wherein:

Fig. 1 is a substantially central, vertical crosssection of my new apparatus.

Fig. 2 is a section along line f 22 of Fig. 1.

Fig. 3 is a fragmental, sectional view showing the heat-conducting unionbetween the coils and the inner vessel.

Fig. 4 is a fragmental, perspective view showing the connections between the coils and the headers or manifolds which are used for supplying cooling fluid to the coils and receiving the fluid after it has passed through-the coils and performed its service. I i I The apparatus comprises an innertank or vessel I disposed within the outer vessel 2 in spaced relation thereto both laterally and at the bottom, the outer vessel 2 thus serving as'a jacket. The vessel 2 is supported upon the legs '3 which are 0 preferably adjustable to admit of raising'or lowering thevessel 2; a

A plurality of hollow coils 4 are secured to the vessel I; preferably on the outside, and each coil is'conn'ected to and communicates at one end 'with'a header or manifold 5-throughwhich cooling fluid-is supplied to the coils,and at the other end with the'header or manifold 6 which receives the fluid from the coils after the fluid has passed therethrough and has rendered service as a cooling medium.

A special feature ofmy invention consists in using a plurality of these-coils instead of a single coil sothat the incomingcooling fluid will be supplied from the manifold 5 to the coils 4 at a plurality of elevations instead of only at the botvessel 2.

tom, as in prior devices of kind. By this means, I obtain a more satisfactory distribution and more uniform cooling of the material Within the vessel I and also great reduction of the head pressure of the cooling fluid. Ordinarily, I provide all of the coils with the same number of convolutions, but the number of convolutions need notbe uniform in each coil and satisfactory results may be obtained by'having one or more coils with a different number of convolutions than other coils.

These coils are positionedsothat there is direct contact of the convolutions of the coils with each other and'with the vessel I.

I have found the coils to the vessel I and also fills the interstices, thus forming a direct and voidless heattransfer structure and union between the contents of the coils and vessel.

My apparatus the contents of the inner is provided with a perforated steam pipe I, whichextends into the lower portion of the space between the vessels I and 2 and is preferably disposed between'the bottom 8 of the inner vessel I and the bottom 9 of the outer vessel 2.

tator or stirrer cover II of the by a reduction The apparatus also has an agi-' I0 which is supported by the inner vessel I and is operated geared motor I2 through the shaft I3. The motor is carried on a bracket I4 which in turn is supported to swivel onthe bracket I5. The motor I2 may thus be swung into or out of operating position relative to the shaft I3.

Water is supplied to the Water jacket consisting of the space between the vessels I and 2 through the pipe I6. This water jacket is closed at the top-by the cover I1 tightlylsecured to and extending from the inner vessel I to the outer The cover II for the innervessel I is preferably hinged at I8 to afford access to However, the entire meet the requirements of sanitation in the treatment of liquids such as milk. One or more ther-f mometers I9 are also provided for ascertaining the temperature of the contents within the ves- '2I and the lever 22.

and 2 is filled with water.

which is usually about thirty minutes. water is then withdrawn through the valve 3| which communicates with the water jacket through the drain pipe 32.;

dioxide, ammonia, etc. material being heated'or'cooled, as the case may be, in the vessel I is shown by the thermometers .19. After'this pasteurizing and cooling, the liq- Iindividual functions.

This vessel I is also provided with an outlet plug valve 20 which is operated through the arm This lever 22 is pivoted at 23 and connects with the swinging arm 24 which has the threaded washer 25 and the nut 26. By pulling the arm 24 downward, the plug valve 20 is raised and liquid in the inner vessel I will flow out'through the pipe 21 whichalso projects through the bottom 9 of the outer ves-' sel 2. The plug valve 20v may be held in open position by swinging the arm 24 so as to bring the washer 25 below the bifurcated bracket 28 and moving the arm 24 into engagement with the bifurcated portion of this bracket. .If it is desired to close the valve 20, the arm'24is swung out of engagement with the bifurcated bracket 28, and through operation of the lever 22, the valve 20 is forced downward until seated, after which the arm 24 is allowed to swing into the. bifurcated portion of the bracket 28, to the position shown in Fig. l.

The interior of the vessel I is provided with aplurality of fins 29, to prevent swirling of the liquid within the. vessel I when this liquid is agitated by the stirrer I0.

The operation of my device is as follows: The

fmate'rial to be treated is placed in the inner vessel I, and the space between the vessels I The stirrer I0 is set inmotion, and steam isthen admitted through the perforated pipe 1 to heatthe water in this water jacket and thereby heat the contents of the vessel I. If milk is being pasteurized with my "device, the steam supply is regulated by the valve 30 to hold the milk within the vesselI at 145F. and for the required length of time, Thehot Cold brine is then circulated from the manifold through 'the coils 4 until the liquid within the vessel I hasreached the required temperature, .generally about 38-40" F. when milk is be- :ing treated. Instead of brine, other refrigerants may be used; for example, cold water, sulphur The temperature of the uid may be'kept in the vessel I, which thus serves as a storage tank, and the desired temperature of the treated material 1 within the vessel I may be readily maintained by regulating the circulation of the. refrigerant through the coils .4. If desired,,the material may be withdrawn immediately after the cooling step, so that the apparatus will be available for receiving other material for treatment.

My new device combines into one receptacle the mechanism and apparatus heretofore employed and involving several devices performing their With my'new apparatus all of the operations The pasteurization is, therefore, ob-

' new apparatus is adaptable to a wide variety of service including the pasteurization of milk, cream, ice cream mixes, chocolate milk, butter milk, especially where limited quantities are involved or where the use of the regular equipmen is not practical. When milk is treated, it may be placed into the vessel I immediately after milking, where the pasteurization and low temperature may be quckly attained and the milk can be retained therein until final dispostion, with practically no rise in temperature. The present invention is not limited to the specific details set forth in the foregoing examples which should be construed as illustrative and not by way of limitation, and in view of the numerous modifications which may be efiectedtherein with out departing from the spirit and scope of this/ invention,it is desired that only such limitations be imposed as :are indicated in the appended claims; i I claim as my invention;

- 1. In a heat-interchange apparatus, an inner vessel, an outer vessel surrounding said inner vessel in spaced relation both laterallyand at the bottom to saidiinner vessel and forming a tight jacket for said inner vessel, a, plurality of hollow coils including coils having a plurality of convolutions, a manifold disposed. between said vessels and in spaced relation to said inner vessel for 2325 tents of said inner vessel.

p 2. In a heat-interchange apparatus, an inner vessel, an outer vessel surrounding said innervessel in spaced relation both laterally andat'the bottom to said inner vesseland forming a tight jacket for said inner vessel, a plurality. of holconvolutions, a manifold disposed between said vessels and in spaced relation tosaid inner'vessel for supplying heat-exchange fluidxto said coils, a

manifold disposed between said vessels and in spaced relation to said innervessel for receiving the fluid after passage throughsaid coils,a perforated steam pipe extending into the spaceibetween said vessels, the convolutions of said'coils being in direct contact with each other andwith said inner vessel, means comprising heat-conlow coils including coils having a plurality of p ducting material in'the interstices betweentl'ie adjacent convolutions ofsaid coilsand saidinner vessel and'forming a direct and voidless heattransfer structure between; the contents of said coils and the contents'of said inner. vessel, and

agitation means within said inner vessel.

3. In a heat-interchange apparatus, an inner vessel, an outer vessel surrounding said'innervessel in spaced relation both laterally and at the bottom tosaid inner vessel and forming a tight jacket for said-inner vesseLaplurality of hollow coils including coils having a plurality of convolutions, a manifold disposed betweencoils, means for connecting saidcoils to said 7 manifolds, means independent of said manifolds for supplying heat-exchange fluid to the space between said vessels, the convolutions of said coils being in direct contact with said inner vessel, and means comprising heat-conducting material in the interstices between the adjacent convolutions the contents of said coils and the contents of said inner vessel.

ROBERT E. KAESTNER. 

